from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Any of various genetically transmitted physical or behavioral characteristics that appear in humans at puberty and in sexually mature animals and that differentiate between the sexes without having a direct reproductive function.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A feature that distinguishes the two sexes of a species, but is not directly part of the reproductive system.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the genetically determined sex characteristics that are not functionally necessary for reproduction (pitch of the voice and body hair and musculature)
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